<template>
    <div class="list" ref="wrapper">
       <div>
            <div class="area">
            <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                       <div class="button"> {{this.$store.state.city}}</div>
                    </div>
                </div>
        </div>
          <div class="area">
            <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div class="button-wrapper" 
                        v-for="item of hot" 
                        :key="item.id"
                        @click="handleCityClick(item.name)"
                    >
                       <div class="button"> {{item.name}}</div>
                    </div>
                </div>
        </div>
          <div 
                class="area" 
                v-for="(item, key) of cities" 
                :key="key"
                :ref="key"
          >
            <div class="title border-topbottom">{{key}}</div>
              <div class="item-list">
                  <div 
                        class="item border-bottom"
                        v-for="innerItem of item" 
                        :key="innerItem.id"
                        @click="handleCityClick(innerItem.name)"
                  >{{innerItem.name}}</div>
              </div>
        </div>
       </div>
    </div>
</template>
<script>
import Bscroll from 'better-scroll'
export default {
    name: 'CityList',
    props: {
        hot: Array,
        cities: Object,
        letter: String
    },
    methods: {
      handleCityClick (city) {
          //派发dispatch到store里面
        //   this.$store.dispatch('changeCity', city)
         this.$store.commit('changeCity', city)
         this.$router.push('/')
      }  
    },
    //监听我们的字母 letter
    watch: {
        letter () {
            if (this.letter) {
                const element = this.$refs[this.letter][0]
                //可以自动将元素滚动到对应的元素
                this.scroll.scrollToElement(element)
            }
        }
    },
     mounted () {
         this.scroll = new Bscroll(this.$refs.wrapper)
    }
}
</script>
<style lang="stylus" scoped>
    @import '~style/varibies.styl'
    .border-topbottom
        &:before
            border-color #ccc
        &:after
            border-color #ccc
    .border-bottom
        &:before
            border-color #ccc
    .list
       overflow hidden
       position absolute
       top 1.58rem
       left 0
       right 0
       bottom 0
     .title
        line-height .54rem
        background #eee
        padding-left .3rem
        color #666
        font-size .26rem
     .button-list
            overflow hidden
            padding .1rem .6rem .1rem .1rem 
        .button-wrapper
                float left
                width 33.3%
            .button
                margin .1rem
                padding .1rem 0
                text-align center
                border .02rem solid #ccc
                border-radius .06rem
        .item-list
        .item
            line-height .76rem
            padding .3rem
            color #666
</style>